is there any technical reason why us accounts might be identified as foreign or is this really a foreign play or us people hiring ppl outside the country
Anger works wonders online.
Speculation: they're resolving historical IP addresses against a current IP geolocation database. An IP which belonged to a US company in 2010 may have since been sold to a Nigerian ISP, but that doesn't mean that the user behind that IP in 2010 was actually in Nigeria.
These are paid astroturfers probably more like call centers, paid for presumably by all sorts of interests from foreign intelligence services, to businesses (or select executives), to internal political groups or politicians trying to manipulate public opinion.
Both political extremes are suffering from this kind of manipulation where real concerns are twisted and amplified for lets say the more gullible half of the population (gullibility knows know political alignment exclusively). The excluded middle is afraid of the people who have been manipulated this way (death threats also know no political boundaries).
with the development capability remaining at twitter anything is possible.
They use professional paid services from these low labour cost countries all the time for publicity or to control the narrative.
By some estimates 20-60% of everything you see on social media is generated by a bot farm, depending on the forum in question. An analysis of Reddit showed some subreddits are 80% AI generated.
The "control the narrative" stuff is mostly a PR campaign by social media intelligence companies trying to make their services seem more valuable than they are.